Weak decays of doubly heavy baryons: the 
                $$1/2\rightarrow 1/2$$
                
                    
                                    
                        
                            1
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                            2
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                            2
                        
                    
                
             case

Wang, Wei; Yu, Fu-Sheng; Zhao, Zhen-Xing

doi:10.1140/epjc/s10052-017-5360-1

Cited by 151 publications

(158 citation statements)

References 85 publications

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“…The present analysis is the sequel and update of the previous works on weak decays of doubly heavy baryons, Ref. [8,13,22]. It improves upon the previous work by…”

Section: Su(3) Symmetry For Semileptonic Decaysmentioning

confidence: 55%

“…The comparison of form factors and decay widths Γ between this work (This) and Zhao's work[8,13,22], and "SE" means "the same extraction method of the form factors as this work".channel f1,S f2,S f3,S g1,S g2,S g3,S f1,A f2,A f3,A g1,A g2,A g3,A Γ/GeV Ξ ++ cc → Λ + c l + ν l [This] 0.495 -0.621 0.832 0.332 1.004 -2.957 0.489 0.290 0.648 -0.111 -0.325 0.943 7.97 × 10 −15 Ξ ++ cc → Λ + c l + ν l [SE] 0.495 -0.621 0.832 0.332 1.004 -2.957 0.479 0.268 0.650 -0.111 -0.307 1.702 7.96 × 10 −15 Ξ + e − [This] 0.140 0.123 -0.066 -0.041 -0.017 0.130 0.134 -0.061 −0.054 -0.042 1.62 × 10 −19 Ξ 0 bb → Ξ 0 b e + e − [22] 0.138 0.132 -0.068 -0.030 -0.055 0.261 0.134 -0.066 0.032 -0.049 1.98 × 10 −19…”

mentioning

confidence: 71%

“…In Ref. [8] the extraction approach is different from the one used in this work and in Refs. [13,22].…”

Section: B Results For Semi-leptonic Decaysmentioning

confidence: 99%

See 2 more Smart Citations

A comprehensive analysis of weak transition form factors for doubly heavy baryons in the light front approach

Xing

2020

Eur. Phys. J. C

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The transition form factors for doubly heavy baryons into a spin-1/2 or spin-3/2 ground-state baryon induced by both the charged current and the flavor changing neutral current are systematically studied within the light-front quark model. In the transition the two spectator quarks have two spin configurations and both are considered in this calculation. We use an updated vertex functions, and inspired by the flavor SU(3) symmetry, we also provide a new approach to derive the flavor-spin factors. With the obtained transition form factors, we perform a phenomenological study of the corresponding semi-leptonic decays of doubly heavy baryons induced by the c → d/sℓ + ν, b → c/uℓ −ν and b → d/sℓ + ℓ − . Results for partial decay widths, branching ratios and the polarization ratios ΓL/ΓT s are given. We find that most branching ratios for the semi-leptonic decays induced by the c → d, s transitions are at the order of 10 −3 ∼ 10 −2 , which might be useful for the search of other doubly-heavy baryons. Uncertainties in form factors, the flavor SU(3) symmetry and sources of symmetry breaking effects are discussed. We find that the SU(3) symmetry breaking effects could be sizable in charmed baryon decays while in the bottomed case, the SU(3) symmetry breaking effects are less significant. Our results can be examined at the experimental facilities in the future. * 1 In the following, we will abbreviate the spin-S 1 to spin-S 2 transition as the S 1 → S 2 transition. If there is no special note, spin-1/2 and spin-3/2 are all with positive parity. We will omit the positive sign of positive parity in the following. c c c c s d u FIG. 1: Spin-1/2 doubly charmed baryons. It is similar for the doubly bottom baryons and the bottom-charm baryons.

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“…The present analysis is the sequel and update of the previous works on weak decays of doubly heavy baryons, Ref. [8,13,22]. It improves upon the previous work by…”

Section: Su(3) Symmetry For Semileptonic Decaysmentioning

confidence: 55%

mentioning

confidence: 71%

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A comprehensive analysis of weak transition form factors for doubly heavy baryons in the light front approach

Xing

2020

Eur. Phys. J. C

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“…Experimental measurements rely on the reconstruction from decay products of Ξ þþ cc . The decay properties of doubly heavy baryons have been intensely studied [3,[35][36][37][38][39][40][41][42].…”

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confidence: 99%

Doubly charmed baryon production in heavy ion collisions

Yao

Müller

2018

Phys. Rev. D

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We give an estimate of Ξ þþ cc production rate and transverse momentum spectra in relativistic heavy ion collisions. We use Boltzmann transport equations to describe the dynamical evolution of charm quarks and diquarks inside quark-gluon plasma. In-medium formation and dissociation rates of charm diquarks are calculated from potential nonrelativistic QCD for the diquark sector. We solve the transport equations by Monte Carlo simulations. For 2.76 TeV Pb-Pb collisions with 0-10% centrality, the number of Ξ þþ cc produced in the transverse momentum range 0-5 GeV and rapidity from −1 to 1 is roughly 0.02 per collision. We repeat the calculation with a melting temperature 250 MeV above which no diquarks can be formed. The number of Ξ þþ cc produced in the same kinematic region is about 0.0125 per collision. We discuss how to study diquarks at finite temperature on a lattice and construct the antitriplet free energy in a gauge invariant but path dependent way. We also comment on extensions of the calculation to other doubly heavy baryons and doubly heavy tetraquarks and the feasibility of experimental measurements. DOI: 10.1103/PhysRevD.97.074003 Recently the LHCb Collaboration reported the observation of a doubly charmed baryon carrying two units of positive charge, Ξ þþ cc , with a mass mðΞ cc Þ ≈ 3621 MeV [1]. Though it is still unclear why the observed mass differs from the previous SELEX result [2], the existence of such doubly charmed baryons is now on a more solid ground. The particle is stable under strong interactions and only decays weakly. The structure of Ξ þþ cc can be thought of as an up quark bound around a deeply bound state (diquark) of two charm quarks [3]. Just as a pair of heavy quark and heavy antiquark attract each other and can form a bound state in the color singlet channel, a pair of two heavy quarks also attract and can form a bound state, a heavy diquark, in the antitriplet representation.The peculiar properties of Ξ þþ cc have stimulated new theoretical and experimental research. Here we consider the production of Ξ þþ cc in high energy heavy ion collisions, where a hot nuclear environment, the quark-gluon plasma (QGP), is produced. Previous work was based on quark coalescence at hadronization and assumed that heavy quarks are thermally distributed [4,5]. Here we pursue out a more dynamical approach considering the formation of bound heavy diquarks within the quark-gluon plasma and the incomplete equilibration of the heavy quark spectrum.In hadron-hadron collisions, it is difficult to produce a pair of heavy quarks in the color antitriplet at leading order in a fragmentation process. On the other hand, the coalescence process involving two independently produced charm quarks is sensitive to the relative momentum between the heavy quark pair. In proton-proton collisions, the relative momentum is uncontrolled and likely large, suppressing the coalescence. Heavy ion collisions have two advantages for Ξ þþ cc production: First, the rapidity density of charm quarks produced in a single colli...

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“…In the diquark-antidiquark model [38], the lifetimes of lowest lying tetraquarks with the spin-parity 0 + and 1 + can be achieved by the operator product expansion(OPE) technique [39,40]. Further more, the flavor SU(3) symmetry analysis which have been successfully applied into heavy mesons or baryons [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] can be used to study the weak decays of bcbq.…”

Section: Introductionmentioning

confidence: 99%

Weak decays of triply heavy tetraquarks $${b{\bar{c}}}{b{\bar{q}}}$$

Xing

2020

Eur. Phys. J. C

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We study lifetimes and weak decays of the triply heavy tetraquarks bcbq. Following the heavy quark expanding(HQE), the lifetimes of tetraquarks bcbq can be expressed as the summation of different dimension operators. Particularly, we obtain the lifetimes of bcbq at the next-to-leading order(NLO) given as τ (T {bb} {cq} ) = 0.70 × 10 −12 s. Besides, we construct the weak decays Hamiltonian of bcbq in hadronic level under the SU(3) flavor symmetry. The discussion of the Hamiltonian can deduce the decay amplitudes and width relations of the tetraquarks. Following the choosing rules, we collect some golden channels for the mesonic decays of tetraquarks, which will be helpful to search for triply heavy tetraquarks bcbq in future experiments. *

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Weak decays of doubly heavy baryons: the $$1/2\rightarrow 1/2$$ 1 / 2 → 1 / 2 case

Cited by 151 publications

References 85 publications

A comprehensive analysis of weak transition form factors for doubly heavy baryons in the light front approach

A comprehensive analysis of weak transition form factors for doubly heavy baryons in the light front approach

Doubly charmed baryon production in heavy ion collisions

Weak decays of triply heavy tetraquarks $${b{\bar{c}}}{b{\bar{q}}}$$

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